One more suggestion, I would first focus on building a game, in case you are doing that and test out your assets and fix eventual issues and optimize them.The sandbag has a 2048x2048 texture for one sandbag, that is far too much, all my sandbag barriers in my game use on single 256x256 texture, which is totally fine.Of course you should keep a high resolution base texture, but I have a high res version of it, that is only 512x512, which is fine for that as well.If your models then reach a gameready state sometime later, you can consider uploading them somewhere, like opengameart.org, it will also give you and your eventual game a bit publicity.